1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef _EXT4_UTILS_H_
18 #define _EXT4_UTILS_H_
19
20 #ifdef __cplusplus
21 extern "C" {
22 #endif
23
24 #ifndef _GNU_SOURCE
25 #define _GNU_SOURCE
26 #endif
27 #define _FILE_OFFSET_BITS 64
28 #define _LARGEFILE64_SOURCE 1
29 #include <sys/types.h>
30 #include <unistd.h>
31
32 #include <sys/types.h>
33 #include <errno.h>
34 #include <stdarg.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <setjmp.h>
39 #include <stdint.h>
40
41 #if defined(__APPLE__) && defined(__MACH__)
42 #define lseek64 lseek
43 #define ftruncate64 ftruncate
44 #define mmap64 mmap
45 #define off64_t off_t
46 #endif
47
48 #include "ext4_sb.h"
49
50 extern int force;
51
52 #define warn(fmt, args...) do { fprintf(stderr, "warning: %s: " fmt "\n", __func__, ## args); } while (0)
53 #define error(fmt, args...) do { fprintf(stderr, "error: %s: " fmt "\n", __func__, ## args); if (!force) longjmp(setjmp_env, EXIT_FAILURE); } while (0)
54 #define error_errno(s, args...) error(s ": %s", ##args, strerror(errno))
55 #define critical_error(fmt, args...) do { fprintf(stderr, "critical error: %s: " fmt "\n", __func__, ## args); longjmp(setjmp_env, EXIT_FAILURE); } while (0)
56 #define critical_error_errno(s, args...) critical_error(s ": %s", ##args, strerror(errno))
57
58 #define EXT4_JNL_BACKUP_BLOCKS 1
59
60 #ifndef min /* already defined by windows.h */
61 #define min(a, b) ((a) < (b) ? (a) : (b))
62 #endif
63
64 #define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))
65 #define EXT4_ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y)))
66
67 /* XXX */
68 #define cpu_to_le32(x) (x)
69 #define cpu_to_le16(x) (x)
70 #define le32_to_cpu(x) (x)
71 #define le16_to_cpu(x) (x)
72
73 #ifdef __LP64__
74 typedef unsigned long u64;
75 typedef signed long s64;
76 #else
77 typedef unsigned long long u64;
78 typedef signed long long s64;
79 #endif
80 typedef unsigned int u32;
81 typedef unsigned short int u16;
82 typedef unsigned char u8;
83
84 struct block_group_info;
85 struct xattr_list_element;
86
87 struct ext2_group_desc {
88 u32 bg_block_bitmap;
89 u32 bg_inode_bitmap;
90 u32 bg_inode_table;
91 u16 bg_free_blocks_count;
92 u16 bg_free_inodes_count;
93 u16 bg_used_dirs_count;
94 u16 bg_flags;
95 u32 bg_reserved[2];
96 u16 bg_reserved16;
97 u16 bg_checksum;
98 };
99
100 struct fs_aux_info {
101 struct ext4_super_block *sb;
102 struct ext4_super_block **backup_sb;
103 struct ext2_group_desc *bg_desc;
104 struct block_group_info *bgs;
105 struct xattr_list_element *xattrs;
106 u32 first_data_block;
107 u64 len_blocks;
108 u32 inode_table_blocks;
109 u32 groups;
110 u32 bg_desc_blocks;
111 u32 default_i_flags;
112 u32 blocks_per_ind;
113 u32 blocks_per_dind;
114 u32 blocks_per_tind;
115 };
116
117 extern struct fs_info info;
118 extern struct fs_aux_info aux_info;
119 extern struct sparse_file *ext4_sparse_file;
120
121 extern jmp_buf setjmp_env;
122
log_2(int j)123 static inline int log_2(int j)
124 {
125 int i;
126
127 for (i = 0; j > 0; i++)
128 j >>= 1;
129
130 return i - 1;
131 }
132
133 int bitmap_get_bit(u8 *bitmap, u32 bit);
134 void bitmap_clear_bit(u8 *bitmap, u32 bit);
135 int ext4_bg_has_super_block(int bg);
136 void read_sb(int fd, struct ext4_super_block *sb);
137 void write_sb(int fd, unsigned long long offset, struct ext4_super_block *sb);
138 void write_ext4_image(int fd, int gz, int sparse, int crc);
139 void ext4_create_fs_aux_info(void);
140 void ext4_free_fs_aux_info(void);
141 void ext4_fill_in_sb(int real_uuid);
142 void ext4_create_resize_inode(void);
143 void ext4_create_journal_inode(void);
144 void ext4_update_free(void);
145 void ext4_queue_sb(void);
146 u64 get_block_device_size(int fd);
147 int is_block_device_fd(int fd);
148 u64 get_file_size(int fd);
149 u64 parse_num(const char *arg);
150 void ext4_parse_sb_info(struct ext4_super_block *sb);
151 u16 ext4_crc16(u16 crc_in, const void *buf, int size);
152
153 typedef void (*fs_config_func_t)(const char *path, int dir, const char *target_out_path,
154 unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities);
155
156 struct selabel_handle;
157
158 int make_ext4fs_internal(int fd, const char *directory, const char *_target_out_directory,
159 const char *mountpoint, fs_config_func_t fs_config_func, int gzip,
160 int sparse, int crc, int wipe, int real_uuid,
161 struct selabel_handle *sehnd, int verbose, time_t fixed_time,
162 FILE* block_list_file);
163
164 int read_ext(int fd, int verbose);
165
166 #ifdef __cplusplus
167 }
168 #endif
169
170 #endif
171